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The_Milky_Way.jpg
This figure presents a new
view of the Milky Way Galaxy obtained by the Diffuse Infrared Background
Experiment (DIRBE) on NASA's Cosmic Background Explorer satellite (COBE). This
image combines images obtained at the near-infrared wavelengths of 1.2, 2.2,
and 3.4 microns, represented respectively as blue, green, and red colors. The
image is presented in galactic coordinates, with the plane of the Milky Way
galaxy horizontal across the center. The region covers galactic longitudes
from 264 degrees (right) to 90 degrees (left), with the Galactic Center at
the center. The dominant source of light at these wavelengths are stars
within our Galaxy. The image strikingly shows both the thin disk and
central bulge populations of stars closer to the Galactic Center than our
own Sun, which lies in the disk at a distance of about 28,000 light years
from the Center. The image is redder in directions where there is more
dust between the stars absorbing starlight from more distant stars. This
absorption is so strong at visible wavelengths that the central part of the
Milky Way cannot be seen at such wavelengths. The discrete points away
from the central disk of the Galaxy are individual stars near the Sun.
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